Here is a sample paragraph about changing a users password temporarily without knowing the original passwords by using the undocumented feature called “by values” of alter user command. Suppose you want to login as user HR but you don’t know its password and you can’t change it all you have to do is backing up the hash key of password from dba_users table. Lets look how ;

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It’s a known feature since at least v5 of Oracle. The only thing that I would caution is if you are attempting to lock up the SYS and SYSTEM accounts so that no one can get in w/o having to set a new password.

For example, alter user SYSTEM identified by values ‘Totally Secured’ will prevent anyone from hacking SYSTEM by any password guessing methods since the hashed value will never equal to ‘Totally Secured’. The only way then, is to reset the password if you need to use the SYSTEM account.

The caution is obviously to ensure that you do have another account that is given privilege to reset other users’ passwords otherwise if you set SYS and SYSTEM as above and you don’t have another account with privilege to reset the password, you are locked out of your db although you still can get in via the OS level with “connect / as sysdba” which is deprecated in 10g.

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